CVE-2026-125071

CVSS 5.7 (medium) · published 2026-11-09

FFmpeg through 9.0.2 contains a NULL pointer dereference vulnerability in libavcodec/jvdec.c that allows attackers to crash applications by supplying oversized JV video packets. Attackers can pass a roughly 268435460-byte packet through the libavcodec API, overflowing the bit count so decode_frame() reads from a NULL buffer and causes denial of service.

Weakness: CWE-252

Source: NVD CVE-2026-125071

References

• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25704
• https://github.com/FFmpeg/FFmpeg
• https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/jvdec.c#L169
• https://github.com/FFmpeg/FFmpeg/commit/839c93f261cd3e1719edfac4244a2d0055ce8841
• https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-null-pointer-dereference-in-jv-video-decoder

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